#ifndef _I386_TYPES_H
#define _I386_TYPES_H

#ifndef __ASSEMBLY__

typedef unsigned short umode_t;

/*
 * __xx is ok: it doesn't pollute the POSIX namespace. Use these in the
 * header files exported to user space
 */

typedef __signed__ char __s8;
typedef unsigned char __u8;

typedef __signed__ short __s16;
typedef unsigned short __u16;

typedef __signed__ int __s32;
typedef unsigned int __u32;

#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
typedef __signed__ long long __s64;
typedef unsigned long long __u64;
#endif

#endif /* __ASSEMBLY__ */

/*
 * These aren't exported outside the kernel to avoid name space clashes
 */
#ifdef __KERNEL__

#define BITS_PER_LONG 32

#ifndef __ASSEMBLY__

#include <linux/config.h>

typedef signed char s8;
typedef unsigned char u8;

typedef signed short s16;
typedef unsigned short u16;

typedef signed int s32;
typedef unsigned int u32;

typedef signed long long s64;
typedef unsigned long long u64;

/* DMA addresses come in generic and 64-bit flavours.  */

/**
 * dma_addr_t代表一个通用的总线地址。
 * 在x86中，对应一个32位长的整数。除非内核支持PAE，这时dma_addr_t代表一个64位的整数
 */
#ifdef CONFIG_HIGHMEM64G
typedef u64 dma_addr_t;
#else
typedef u32 dma_addr_t;
#endif
typedef u64 dma64_addr_t;

#ifdef CONFIG_LBD
typedef u64 sector_t;
#define HAVE_SECTOR_T
#endif

/**
 * 高速缓存对象描述符。将slab中的空闲对象链接起来。
 */
typedef unsigned short kmem_bufctl_t;

#endif /* __ASSEMBLY__ */

#endif /* __KERNEL__ */

#endif
